无线通信系统射频前端高性能小型化滤波器研究
发布时间：2018-08-01 14:52
【摘要】：滤波器作为无线通信系统中的重要组成部分,用以抑制带外干扰和谐波,其性能和体积是实现系统高性能、小型化的关键。特别是在当今无线通信中广泛应用,频谱资源短缺的情况下,高性能滤波器对多模、多频无线通信设备尤为重要。由于成本、性能等综合因素,滤波器采用传统的工艺实现,导致性能较差、体积较大,阻碍了滤波器朝着小型化、高性能发展。波导滤波器和微带滤波器都具有易设计、低成本、小尺寸、易于与其它电路集成等优点,且可利用标准的PCB工艺制作,自问世以来即受到广泛关注。本论文针对半模基片集成波导和其它平面谐振器展开小型化和高性能滤波器研究,结合无线通信系统实际需求,深入探讨双带、宽带、三带等不同要求下,滤波器结构设计关键问题,利用了行之有效的小型化高性能滤波器设计方案,取得如下成果：1.利用CSRR-HMSIW结构分别与紧凑型短路CRLH-TL结构和CSRR-DGS结构设计了两款双带滤波器。提出了CSRR-HMSIW结构和紧凑型短路CRLH-TL结构的结合方式,实现了高性能、小型化的双带滤波特性；采用电路和结构的曲线拟合比较法得到了CSRR-HMSIW和CSRR-DGS的双带滤波器单元结构与等效电路之间的对应关系,联级两个单元结构设计了中心频率分别为2.5GHz和5.4GHz的双带滤波器。选用锥形渐变馈电的方式实现了模式变换和阻抗匹配,提高了滤波器的外部品质因素。2.利用新型的阶跃阻抗谐振器(SIR)结构设计了一款双带滤波器和三带滤波器。运用奇偶模理论分析了SIR谐振器的阻抗比、电长度与谐振器基频、谐波的关系,确定了SIR实现小型化设计方案。在设计双带滤波器中,采用了斜对称的0°耦合馈电结构,实现了阻带传输零点的引入,提高了带外抑制性能。并引入源和负载之间的耦合与新型的SIR特性设计了三带滤波器,减小了滤波器尺寸。3.提出了基于双闭环SIR谐振器结构的双带滤波器。利用奇偶模理论分析确定了其结构参数与性能之间的关系,采用耦合馈电方式,在阻带产生了四个传输零点,提高了阻带抑制特性和通带间的隔离。4.利用三模SIR结构设计了宽带滤波器。应用奇偶模理论分析了三模SIR谐振器结构,利用电磁场仿真软件验证了该结构的特性,确定了谐振频点和结构参数间的关系,应用该结构设计和制作了一款宽带滤波器。实测结果表明,此滤波器插入损耗小于0.39dB,而且通带平坦度、频率选择特性性能优异。
[Abstract]:As an important part of wireless communication system, filter is used to suppress out-of-band interference and harmonics. Its performance and volume are the key to achieve high performance and miniaturization of the system. Especially in today's wireless communication, high performance filter is very important for multi-mode and multi-frequency wireless communication equipment. Because of the comprehensive factors such as cost and performance, the filter is realized by traditional technology, which leads to poor performance and large volume, which hinders the development of filter towards miniaturization and high performance. Waveguide filters and microstrip filters have the advantages of easy design, low cost, small size, easy integration with other circuits, and can be fabricated by standard PCB technology. In this paper, the miniaturization and high performance filter research for half-mode substrate integrated waveguide and other planar resonators is carried out. Combined with the actual demand of wireless communication system, the requirements of dual-band, wideband and three-band are discussed deeply. The key problems of filter structure design are discussed. The effective miniaturization and high performance filter design scheme is used, and the following results are obtained: 1. 1. Two kinds of double band filters are designed by using CSRR-HMSIW structure, compact short circuit CRLH-TL structure and CSRR-DGS structure, respectively. The combination of CSRR-HMSIW structure and compact short circuit CRLH-TL structure is proposed to realize the high performance and miniaturized dual-band filter. By using the curve fitting comparison method of circuit and structure, the corresponding relationship between the structure of dual-band filter unit and equivalent circuit of CSRR-HMSIW and CSRR-DGS is obtained, and the dual-band filter with center frequency of 2.5GHz and 5.4GHz is designed in the two unit structures. The mode transformation and impedance matching are realized by tapered gradual feed, which improves the external quality factor of filter. 2. A two-band filter and three-band filter are designed using a new step impedance resonator (SIR) structure. The relationship between impedance ratio, electric length and fundamental frequency and harmonic of SIR resonator is analyzed by using odd-even mode theory, and the miniaturization design scheme of SIR is determined. In the design of the dual-band filter, the skew symmetrical 0 掳coupling feed structure is adopted, the zero point of stopband transmission is introduced, and the performance of out-of-band suppression is improved. The coupling between the source and the load and the new SIR characteristic are introduced to design the three-band filter, which reduces the filter size. A double band filter based on double closed loop SIR resonator structure is proposed. The relationship between structure parameters and performance is determined by using even and odd mode theory. Four transmission zeros are generated in stopband by coupling feed mode, which improves stopband suppression characteristics and isolation between passbands. 4. A three-mode SIR structure is used to design a wide band filter. The structure of three-mode SIR resonator is analyzed by using even-odd mode theory. The characteristics of the structure are verified by electromagnetic field simulation software. The relationship between resonance frequency and structural parameters is determined. A wideband filter is designed and fabricated with this structure. The experimental results show that the insertion loss of the filter is less than 0.39 dB, and the pass band flatness and frequency selection performance are excellent.
【学位授予单位】：西南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN713;TN92
本文编号：2157933
[Abstract]:As an important part of wireless communication system, filter is used to suppress out-of-band interference and harmonics. Its performance and volume are the key to achieve high performance and miniaturization of the system. Especially in today's wireless communication, high performance filter is very important for multi-mode and multi-frequency wireless communication equipment. Because of the comprehensive factors such as cost and performance, the filter is realized by traditional technology, which leads to poor performance and large volume, which hinders the development of filter towards miniaturization and high performance. Waveguide filters and microstrip filters have the advantages of easy design, low cost, small size, easy integration with other circuits, and can be fabricated by standard PCB technology. In this paper, the miniaturization and high performance filter research for half-mode substrate integrated waveguide and other planar resonators is carried out. Combined with the actual demand of wireless communication system, the requirements of dual-band, wideband and three-band are discussed deeply. The key problems of filter structure design are discussed. The effective miniaturization and high performance filter design scheme is used, and the following results are obtained: 1. 1. Two kinds of double band filters are designed by using CSRR-HMSIW structure, compact short circuit CRLH-TL structure and CSRR-DGS structure, respectively. The combination of CSRR-HMSIW structure and compact short circuit CRLH-TL structure is proposed to realize the high performance and miniaturized dual-band filter. By using the curve fitting comparison method of circuit and structure, the corresponding relationship between the structure of dual-band filter unit and equivalent circuit of CSRR-HMSIW and CSRR-DGS is obtained, and the dual-band filter with center frequency of 2.5GHz and 5.4GHz is designed in the two unit structures. The mode transformation and impedance matching are realized by tapered gradual feed, which improves the external quality factor of filter. 2. A two-band filter and three-band filter are designed using a new step impedance resonator (SIR) structure. The relationship between impedance ratio, electric length and fundamental frequency and harmonic of SIR resonator is analyzed by using odd-even mode theory, and the miniaturization design scheme of SIR is determined. In the design of the dual-band filter, the skew symmetrical 0 掳coupling feed structure is adopted, the zero point of stopband transmission is introduced, and the performance of out-of-band suppression is improved. The coupling between the source and the load and the new SIR characteristic are introduced to design the three-band filter, which reduces the filter size. A double band filter based on double closed loop SIR resonator structure is proposed. The relationship between structure parameters and performance is determined by using even and odd mode theory. Four transmission zeros are generated in stopband by coupling feed mode, which improves stopband suppression characteristics and isolation between passbands. 4. A three-mode SIR structure is used to design a wide band filter. The structure of three-mode SIR resonator is analyzed by using even-odd mode theory. The characteristics of the structure are verified by electromagnetic field simulation software. The relationship between resonance frequency and structural parameters is determined. A wideband filter is designed and fabricated with this structure. The experimental results show that the insertion loss of the filter is less than 0.39 dB, and the pass band flatness and frequency selection performance are excellent.
【学位授予单位】：西南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN713;TN92
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